For a lot of folks in the modern day, knitting is more a relaxing hobby than a household necessity. However, not too long ago, this needlecraft was a genuine -- and effective! -- tool for spies. In the first part of this two-part series, Ben, Noel and Max dive into the fascinating history of knitting as espionage.

CLASSIC: The Night Witches: How an All-female Soviet Bomb Squad Terrorized Nazi Germany
31:35

Mata Hari: Courtesan Turned WWI Double Agent?
36:53

That Time We Made Backpack Nukes
31:27